<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="信息描述">
        <el-tag type="info">excel模版说明</el-tag>
        <el-tag>
          <i class="el-icon-download"/>
          <a :href="OSS_PATH + '/excel/subject.xlsx'">点击下载模版</a>
        </el-tag>

      </el-form-item>

      <el-form-item label="选择Excel">
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :limit="1"
          :action="BASE_API+'/eduservice/subject/import'"
          name="file"
          accept="application/vnd.ms-excel">
          <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
          <el-button
            :loading="loading"
            style="margin-left: 10px;"
            size="small"
            type="success"
            @click="submitUpload">{{ fileUploadBtnText }}</el-button>
        </el-upload>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {

  data() {
    return {
        BASE_API : process.env.BASE_API,  // 将config里面保存的BASE_API取出来，固定写法
        OSS_PATH : process.env.OSS_PATH, // OSS的地址
        importBtnDisabled : false,
        loading : false,
        fileUploadBtnText: "上传到服务器",
    }
  },
  created() {
  },

  watch: {

  },

  methods: {
    //   上传动作
    submitUpload() {
        this.fileUploadBtnText = '正在上传'
        this.importBtnDisabled = true
        this.loading = true
        this.$refs.upload.submit()
    },
    // 上传成功
    fileUploadSuccess(response) {
        if (response.success === true) {
            this.fileUploadBtnText = '导入成功'
            this.loading = false
            this.$message({
                type: 'success',
                message: response.message
            })
            this.$router.push( {path: '/subject/tree'} )
        } else {
            this.fileUploadError(response)
        }
    },
    // 上传失败
    fileUploadError(response) {
        this.fileUploadBtnText = '导入失败'
        this.loading = false
        this.$message({
            type: 'error',
            message: '导入失败'
        })
    }
  }
}
</script>
